public class Student {
    public String name;
    public int age;
    public data birthday;
    public String sno;
    public Student(String name, int age, data birthday, String sno) {
        this.name = name;
        this.age = age;
        this.birthday = birthday;
        this.sno = sno;
    }
}
class data{
    public int year;
    public int month;
    public int day;

    public data(int year, int month, int day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }
}
